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The Lined Tailing Facility (LTF) collection pond leak -detection system was monitored <br />monthly and evacuated. The monthly leak -detection flows for 2015 ranged from a low of <br />26.7 gallons per day (gpd) to a high of 33.0 gpd. The average monthly leak -detection flow <br />for 2015 was 29.3 gpd. The monthly leak -detection flows were submitted previously in the <br />Monthly Reports and are also included in Appendix A of this report. The leak -detection <br />system water was sampled and analyzed quarterly and the laboratory analysis results <br />were submitted to CDRMS in the Monthly and Quarterly Sampling Reports and are also <br />included in Appendix A of this report. <br />The LTF underdrain flows were monitored monthly at the base of the embankment and the <br />flows for 2015 ranged from a low of 38.0 gpm to a high of 42.1 gpm. The monthly <br />average underdrain flow for 2015 was 39.9 gpm. The monthly underdrain flows were <br />submitted previously to CDRMS in the Monthly Reports and are also included in Appendix A <br />of this report. <br />The LTF lysimeters were monitored monthly. The lysimeters were dry and no groundwater <br />was present for sampling or analysis in 2015. The monthly lysimeter readings were <br />submitted previously to CDRMS in the Monthly Reports and are also included in Appendix <br />A of this report. <br />Technical Revisions/Permit Amendments <br />BMRI continues to follow and comply with the current approved technical revision TR -26 <br />(May 23, 2000). The alluvial hydrologic system for the Rito Seco and West Pit <br />continued to be managed during 2015 in compliance with TR -26. BMRI measured the <br />West Pit backfill monitoring wells weekly and the calendar month average groundwater <br />measurement elevations were below the 8582 feet above mean sea level (amsl) <br />required. The groundwater table elevations and potentiometric surface maps, developed by <br />Advanced Environmental Sciences, Inc., confirm the groundwater flow gradient was from the <br />Rito Seco alluvium to the West Pit backfill during 2015. BMRI also performed monthly <br />visual seepage expression inspections in the historic seepage area along the Rito Seco <br />Creek as required. No seepage expressions were observed in the historic seepage area <br />during 2015. <br />Additionally, the two groundwater capture wells (M-32 and M-33), were operated in <br />conjunction with groundwater table elevation control in the West Pit during the 2015 <br />calendar year. Groundwater elevations were maintained equal to or lower than 8540 feet <br />amsl in wells M-32 and M-33 as required. Groundwater pumped from these wells was <br />either treated at the West Pit Water Treatment Plant and discharged to the Rito Seco under <br />the BMRI discharge permit, or pumped to the LTF for management. In 2015, the West <br />Pit water treatment plant treated and discharged a total of 92,068,500 gallons of water to the <br />Rito Seco Creek. Additionally, a total of 15,038,600 gallons of water was transferred from <br />the West Pit to the LTF. <br />Annual Report and Fee - 2015 4 AES, Inc. <br />Battle Mountain Resources - San Luis, CO March 2016 <br />